BIO3 vs CircadiaOS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BIO3
This app helps Dartmouth College BIO3 students track their mindfulness practice. Log meditation sessions, monitor progress, and view course leaderboard standings. It prioritizes user privacy with secure data storage and opt-in research participation.
- Log meditation sessions (duration, quality, stress)
- Track group practice participation
- Monitor personal progress
- View course leaderboard
- Access mindfulness resources
- Secure data storage
Read full descriptionHide full description
BIO3 is a mindfulness tracking app developed by the Media and Health Lab at Dartmouth College, designed exclusively for students enrolled in the BIO3 course. WHAT YOU CAN DO: - Log daily meditation sessions including duration, quality ratings, and stress levels - Track your group practice participation records - Monitor your personal progress over time - View your standing on the course leaderboard - Access curated resources to support your mindfulness practice PRIVACY FIRST: Your data is stored securely and is never sold or shared with third parties. Students who choose to participate in research do so through a separate opt-in process. All research data is anonymized and used only for academic publications by the MHBLD Lab at Dartmouth College. Developed by the Media and Health Lab (MHBLD) at Dartmouth College.
CircadiaOS
This app learns your body's ideal sleep temperature and automatically adjusts your smart thermostat throughout the night. It uses data from your wearable to personalize a four-phase temperature schedule for optimal sleep recovery. Requires a compatible smart thermostat and sleep-tracking wearable.
- Learns ideal sleep temperature
- Personalized four-phase temperature schedule
- Integrates with smart thermostats
- Syncs with sleep-tracking wearables
- Analyzes sleep quality
- Two-week calibration period
Read full descriptionHide full description
CircadiaOS adjusts your bedroom temperature through the night, automatically. Your body temperature isn't constant while you sleep. It drops as you fall asleep, stays low through your deepest sleep, and rises again before you wake. A thermostat held at one number all night works against that. CircadiaOS builds a temperature curve for your night and drives your smart thermostat to follow it. Connect a wearable and the curve adapts to your own recorded nights instead of a general model. HOW IT WORKS - Connect your thermostat and your wearable - CircadiaOS builds a curve from your profile on night one - As your nights accumulate, the curve shifts to your own data - See exactly which parts come from your sleep and which are still estimates WHAT YOU SEE - Tonight's schedule, phase by phase - Why each setpoint is what it is - Your best and worst nights, side by side, and what differed Requires a compatible smart thermostat. A wearable is optional but unlocks personalization from your own sleep data. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: BIO3 at 5.0 against CircadiaOS's 3.8. BIO3 also leads on in-app purchases (none vs 4) and ads (none vs shown). CircadiaOS's advantage is ratings volume (10 vs 2). On price, update cadence, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. CircadiaOS sells 4 in-app purchases, starting at $9.99 per month. BIO3 asks for nothing beyond the download.
BIO3 holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: CircadiaOS has 10 ratings behind it against 2, so its average is the more settled of the two.
BIO3 ships an update every 2 days, CircadiaOS every 3 days. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.
| Parameter | BIO3 | CircadiaOS |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 3.8 (10 ratings) |
| Positive reviews | — | 75.0% of reviews |
| Number of ratings | 2 | 10 — better |
| Update frequency | Every 2 days — better | Every 3 days |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.5 | 18.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 25 MB |
| Age rating | 4+ | 17+ |
| Developer | Yashaswini Rajendra Bhat | CircadiaOS LLC |
In-app purchases
BIO3
No in-app purchases
CircadiaOS
- CircadiaOS Lite Monthly$9.991 Month
- CircadiaOS1 Month trial$19.991 Month
- CircadiaOS Lite Yearly$99.991 Year
Show 1 moreShow fewer
- CircadiaOS1 Month trial$159.991 Year









